What is WLMailApiAgent.exe?

The .exe extension on a filename indicates an executable file. Executable files may, in some cases, harm your computer. Therefore, please read below to decide for yourself whether the WLMailApiAgent.exe on your computer is a Trojan that you should remove, or whether it is a file belonging to the Windows operating system or to a trusted application.

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WLMailApiAgent.exe file information

Windows Task Manager with WLMailApiAgent
WLMailApiAgent.exe process in Windows Task Manager

The process known as Signal Spam AddIn belongs to software PC Tools Internet Security or Signal Spam AddIn by PC Tools ( or Signal Spam.

Description: WLMailApiAgent.exe is not essential for the Windows OS and causes relatively few problems. The WLMailApiAgent.exe file is located in a subfolder of "C:\Program Files". Known file sizes on Windows 10/8/7/XP are 97,240 bytes (66% of all occurrences) or 72,192 bytes. 
The process has no file description. The program has no visible window. The program starts upon Windows startup (see Registry key: MACHINE\Run, Run). The WLMailApiAgent.exe file is not a Windows system file. WLMailApiAgent.exe is a Verisign signed file. The file is certified by a trustworthy company. WLMailApiAgent.exe is able to record keyboard and mouse inputs. Therefore the technical security rating is 43% dangerous.

Uninstalling this variant: If problems with WLMailApiAgent.exe come up, you may want to safely remove the program using the uninstall program of PC Tools Internet Security or Signal Spam AddIn (Control Panel ⇒ Uninstall a Program), contact [1][2] to assist you or search for an update on the vendor’s website.

Recommended: Identify WLMailApiAgent.exe related errors

Important: Some malware camouflages itself as WLMailApiAgent.exe, particularly when located in the C:\Windows or C:\Windows\System32 folder. Therefore, you should check the WLMailApiAgent.exe process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.


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Best practices for resolving WLMailApiAgent issues

A clean and tidy computer is the key requirement for avoiding problems with WLMailApiAgent. This means running a scan for malware, cleaning your hard drive using 1cleanmgr and 2sfc /scannow, 3uninstalling programs that you no longer need, checking for Autostart programs (using 4msconfig) and enabling Windows' 5Automatic Update. Always remember to perform periodic backups, or at least to set restore points.

Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the 6resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off repairing of your installation or, for Windows 8 and later versions, executing the 7DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the WLMailApiAgent.exe process on your computer, the following programs have proven to be helpful: ASecurity Task Manager displays all running Windows tasks, including embedded hidden processes, such as keyboard and browser monitoring or Autostart entries. A unique security risk rating indicates the likelihood of the process being potential spyware, malware or a Trojan. BMalwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

WLMailApiAgent.exe [all]